NAME: ______H.R: ______DATE: ______
SCI & TECH 204
The Living World SECTION 3: Life Sustaining Processes
Two Vital Functions of the Cell (p. 284-285)
· Cells get the energy they need to grow and function from the food they consume.
· Energy contained in the food is released during a chemical reaction called cellular respiration.
· Plants produced their food themselves with a function called photosynthesis.
Complete the table below.Plants / Animals (including humans)
Photosynthesis / Cellular Respiration / Cellular Respiration
· Plant cells produce carbohydrates from solar energy, carbon dioxide and water.
· This reaction releases oxygen.
· Plant cells store the carbohydrates they produce. / · Plant cells use carbohydrates as an energy source, with the help of oxygen.
· This reaction produces carbon dioxide and water. / · Animal cells use carbohydrates as an energy source, with the help of oxygen.
· This reaction produces carbon dioxide and water.
· Plants use sunlight as an energy source to manufacture carbohydrates from carbon dioxide and water.
· The water comes from the roots.
· The leaves absorb carbon dioxide present in the air.
· Photosynthesis is very important because carbohydrates are at the root of everything that living organisms eat.
Draw an input/output diagram of photosynthesis.
· Cellular respiration transforms carbohydrates into energy.
· The mitochondria in the cell absorb carbohydrates and oxygen releasing energy in a chemical reaction.
Draw an input/output diagram of cellular respiration.
In the space below, answer # 6 & 7 from the Memory Check (p. 285)
· The same substances are involved in both processes (water, carbohydrates, carbon dioxide, and oxygen).
· Both processes involve energy.
· Both processes involve chemical reactions.
· In photosynthesis, carbohydrates are being produced and stored. While in cellular respiration, carbohydrates are being used to produce oxygen.
· In photosynthesis, carbon dioxide is consumed and oxygen is produced. In cellular respiration, oxygen in consumed and carbon dioxide is produced.
· Photosynthesis requires sunlight while cellular respiration does not.
7. Trees are called the lungs of the Earth because they “breathe” in a way similar to animals. During the day they produce oxygen (photosynthesis occurs), while at night they produce carbon dioxide (cellular respiration occurs).